New Port Richey, Florida - We are learning new details about the day a retired Tampa police officer allegedly shot and killed another man inside the Cobb Grove 16 movie theater in Wesley Chapel on Monday.

"He was very calm. He was seated in the chair looking straight ahead at the screen," said Sgt. Steve Greiner.

Greiner was the first member of the Pasco County Sheriff's Office to come into contact with alleged shooter Curtis Reeves, who is accused of shooting Chad Oulson to death.

It was part of several new details to arise out of a Tuesday press conference hosted by Pasco County Sheriff Chris Nocco. It's the first time we heard the accounts of first responder Sgt. Greiner and the detectives currently working the case against Reeves.

Among the questions that members of the Pasco County Sheriff's Office attempted to answer was why Reeves, who can be seen walking to a police cruiser after his arrest, was unguarded by a deputy.